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<p>Metal injection molding (MIM) of titanium alloys is a versatile and cost-effective approach for producing complex components with tailored porosity, making it attractive for biomedical applications. However, due to titanium’s strong affinity for oxygen, an inert atmosphere is required during sintering to prevent spontaneous oxidation. In this study, we investigate the use of a molten salt as protective shield for debinding and sintering of Ti and TiNb alloys fabricated from MIM feedstocks. Microstructural and mechanical tests were conducted to assess the impact of molten KCl salt on the sintering behavior and mechanical properties of these alloys. No signs of oxidation were found in the Ti and TiNb parts, suggesting that molten salt effectively prevents oxidation during the sintering process. Furthermore, compared to vacuum sintering, molten salt shield sintering produced Ti and TiNb parts with higher porosity and lower elastic modulus, which could reduce the risk of stress shielding in bone implant applications.</p>

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Molten Salt Shielding Sintering of Porous Ti and Ti-Nb Alloys Fabricated from Metal Injection Molding Feedstocks

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • F. Signor,
  • S. Noal Alves,
  • D. D. Lima,
  • W. L. Bevilaqua,
  • P. H. Mareze,
  • N. F. Daudt

摘要

Metal injection molding (MIM) of titanium alloys is a versatile and cost-effective approach for producing complex components with tailored porosity, making it attractive for biomedical applications. However, due to titanium’s strong affinity for oxygen, an inert atmosphere is required during sintering to prevent spontaneous oxidation. In this study, we investigate the use of a molten salt as protective shield for debinding and sintering of Ti and TiNb alloys fabricated from MIM feedstocks. Microstructural and mechanical tests were conducted to assess the impact of molten KCl salt on the sintering behavior and mechanical properties of these alloys. No signs of oxidation were found in the Ti and TiNb parts, suggesting that molten salt effectively prevents oxidation during the sintering process. Furthermore, compared to vacuum sintering, molten salt shield sintering produced Ti and TiNb parts with higher porosity and lower elastic modulus, which could reduce the risk of stress shielding in bone implant applications.